Electric bell



Nov.

R. B. BENJAMIN ELECTRIC BELL Filed Marcl:Z%, 1919 3 Sheets-Sheet 1 R. B.BENJAMIN Nov. 13

ELECTRIC BELL 1919 3 Sheets-Sheet 2 Filed March 1 Nov. 13 1923.

R. B. BENJAMIN ELECTRIC BELL Filed March 1,1919 3 Sheets-Sheet 5Patented Nov. 13, 1923.

UNITED STATES PATENT OFFICE.

REUBEN 1B. BENJAMIN, OF CHICAGO, ILLINOIS. ASSIGNOR TO BENJAMIN ELECTRICMANUFACTURING COMPANY, 61? CHICAGO. ILLINOIS. A CORPORATION OF ILLINOIS.

ELECTRIC BELL.

Application filed March 1, 1919.

T all whom it may concern Be it known that I, REUBEN B. BENJAMIN, acitizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented new and useful Im provements inElectric Bells. of which the following is a full, clear, concise, andexact description. reference being bad to the 3C companying drawing.forming a part .of this specification.

My invention relates to improvements in electric bells. and one of theobjects of my invention is to provide an electric bell in which all ofthe hammer-actuating mecha nism is enclosed in a sealed casing, theactuating mechanism being mounted upon and supported by the casing insuch a manner that the casing may be opened for inspection and repair ofthe parts wilhout disturbing or displacing any of the operatingmechanism of; the bell.

Other objects and advantages of my invention will appear more fully inthe accompanying specifications and drawings.

For the purpose of disclosing my invention I have illustrated certainembodiments thereof in the accompanying drawings, in which Fig. 1 is aplan view oia bell embodying my invention and having the cover for thecasing removed and certain parts shown in section;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a detail view showing means for adjusting the gong;

Fig. 4 is a plan View of another form of hell embodying my invention;

Fig. 5 is a plan view of the bell illustrated in Fig. 4, with the coverremoved;

Fig. 6 is an elevational view of the construction shown in Fig. 4, theview being taken from the lower side of Fig. 4, and parts being brokenaway to show the interior construction; and

Fig. 7 is a side elevational view of the construction shown i Fig. 4.the view be ing taken from the left, and parts being broken away to showthe interior construction.

In the embodiment illustrated in Figs. 1 to 3. I provide a cylindricalcasing having a side Wall 1 and the bottom 2 preferably formed in onepiece. At one point on the side wall of the casing there is formed aSerial No. 280,012.

boss 3 having an opening through which the leading-in Wires are brought.This opening is internally screw-threaded to receive the end of theconduit pipe which leads to the casing and is thereby effectuallysealed. or the opening may be sealed in any other suitable manner ifdesired. A second boss at is formed on the side wall of the casing.which is internally screw-threaded to re ceive a plug 5. A pair ofscrews 6 and 7 extend through the casing at this point. for a purposemore fully hereinafter described. These screws also pass through a lockplate 8. which may be slightly tilted by the screw 9 which passestherethrough and bears against the wall of the casing to lock the screwsagainst rotation. The casing has its side wall bulged or extended at 10,and within the casing this bulged portion is channeled at ll. to form anupper and lower bearing for a rock shaft 12, which passes through anopening in the top of the bulged portion of the casing and has its lowerend seating in the bottom of the bulged portion. The top portion of thecasing surrounding the rock shaft is provided with a countersunk opening13 having a tapering bottom and adapted to receive a suitable packing Hwhich surrounds the rock shaft 12 and is held in position by acountersunk screw 15 surrounding the rock shaft. By this arrangement thepoint at which the rock shaft passes into the casing is sealed againstthe entrance of dust. or moisture. The upper end of the rock shaft isbent at right angles and bowed to form a spring hammer arm 16. which atits free end carries the striker or hammer 17 for the bell. Theoperating mechanism of the bel all mounted on and within the casing andcinnprises an electroniagnet having a pair of windings 18. the cores 19of which are secured to a yoke 20. which in turn is secured by a pair ofscrews 21 to a pair of lugs (not shown) project ing upwardly from andformed integrally with the bottom 2 of the casing. An armature 22 liesopposite the poles of the coils 18 and at one end is non-rotatablysecured to the rock shaft 12. so that any movement imparted to thearmature will operate the rock shaft and, in turn, operate the strikerarm 16. The opposite or free end of the armature has connected thereto arelractile spring 23. One end oi this spring is hooked through anopening in the inner end of the screw 6 and the opposite end passesthrough an opening in the armature and is hooked over a plate 24, whichplate. is larger than the opening in the armature. This arrangementpermits the spring to rotate with the screw 6 and at the same timeconnects the spring and armature together. This spring acts to retractthe armature from the poles of the magnet when the circuit through themagnet. is broken. and it will be noted that by the arrangement of thescrew 6 adjustment of the tension of this spring may he made from theexterior of the casing hy removing the plug 5 from the nipple 4. Mountedwithin the casing on a pair of lugs .25 extending upwardly from andintegrally cast with the hottorn .2 is an insulating hase :36. on whichare mounted a pair oi binding plates 27 and 28 carrying binding-poststor the leading-in wires. These hindingposts are separated from oneanother by a rib 29 formed on the base. The binding plate 27 hasupstanding therefrom a lug 3th to which is secured a flat spring 31carrying one con tact 32 ot the circuit-breakcr art the opcratingmagnet, The free end ol this spring rests upon an insulating tip on theend of the screw T, so that by adjusting the screw 7 the spacing of thecontacts of the circuithreaker may be adjusted. and it will be notedthat this screw may be adjusted from the ex terior of the casing simplyby removing the plug 5 of the nipple l. The terminal plate 9? has anupstanding lug 33 to which is secured the flat contact spring ill of thecircuit-breaker. which spring at its free end carries a contact 35co-opcrating with the contact 32. and is also provided with aninsulating tip 36 adapted to pass through an elongated opening 37 in apin 39 extending from the free end of the armature :22. so that as thearmature is attracted by the operating magnet the contacts 32 and 3.7will be separated. .\t the same time. due to th fact that the opening.37 is slightly elongated. a certain amount of movement of the armaturewill be permitted hel'in'c these contacts are separated. Formed on thebat-c Qt; is a butter Iii) against which is adapted to strike the freeend of a butter spring 4-0 sc cured at one end to the armature 22 andhav ing its tree end slightly separated from the armature. This springacts as a butter and takes up a certain amount of the jar on thearmature due to its return to normal position when the circuit-hriu1keris opened each time.

The interior of the cylindrical wall l of the casing is screwthreaded toreceive the threaded flange 41 ot the cover plate 42. which is therebysecured in position. The edge of the casing wall and the edge of theplate are bevelled. as at 43. to insure a close fit at this point.

The gong 44 is supported hy the cover plate, and to this end there istermed on Ihr cover plate a hollow split post 45. which is exteriorlytapered and scren threaded to re ceive a clamping nut in A stein l? ismounted in the post and has the gong eccentrieally secured thereto atits upper end by a bolt. 48. Due to the eccentric inouuting of the. gongpost the gong may be ad justed to and from the striker l7. and a l'lerthe proper adjustment has been made. by setting the nut 46 the stem willbe securely clamped in the post and the gong held against displacement.

In Figs. 4 to T. inclusive. l have illustrated a modified form of myinvention. In the structure illustrated in these figures 1 provide acasin preferably cylindrical in shape and having the cylindrical walls49 and the bottom 50 preteralily cast in one piece. Formed in the wallsat a suitable point is a boss 51 through which the leadlug-in wires arebrought and which is in ternally screw-threaded to receive the coir duitpipe. which thereby effectually seals the casing at this point; or thecasing may be sealed in any other desired manner. The body of the casingis provided with inte grally cast lugs 52 having openings for at tachingscrews. and the upper edge oi the walls 49 has an inwardy extendingflange 52, to form a seat for the cover plate 5 1. .\t intervals theside wall 19 is thickened or has inwardly extending lugs 55 adapted tore ceive the clamping screws 56 for the cover. At one point on the wall49 1 form a lug or in turned extension 57. which in eftect forms aportion of the flange 53. The purpose and advantage of this lug willappear more fully hereinafter.

All of the operating parts of the hell are mounted within the casing.and for operating the hell I provide the tonal ele troniagnet.comprising the coils 58 having their cores .39 secured l) screws Ct] toa yoke (31. which in turn is secured by s rews 432 to a pair of lugs(iii cast integrally with and extending up ardly from the bottom 5Opposite the poles of the magnet is arranged an arn'iature (H- split anddrilled at one end and clamped to and supported by a rock shatt whichshaft is journaled at its bottom in a post 66 formed integrally with andextending upwardly from the bottom 50 and the lug 57. through which lugthe shaft passes. The post. 66 and the lug 57 are spared apart toaccommodate the pivoted end of the armature 64 and form the bearings torthe rock shaft 65. which shaft at its upper end is turned at rightangles and bowed to form the striker arm (37 of the bell. having asuitable striker 68 secured at its free end. '.\t the point where theshaft passes through the lug or casing a count ersink opening is formedaround the shaft. this opening heing tapered at its bottom ill) andadapted to receive a suitable packing 69, which packing: is held inposition by a screw surrounding the rock shaft and screwing into thecountersink opening. An insulatin c base T1 is mounted within the casingon a pair of upwardly extending lugs 72 and carries the twobinding-post; terminal plates ill and H to which the leading-in wiresare connected. The binding post terminal plate 73 has an up-turnedprojection T5, into which is threaded a screw 76 carrying one of thecont at ts 77 ot the circuitbreaker. An angle plate T8 is secured to thebase T l. and on the upwardly extending portion oi this plate is mounteda leaf spring 79. the free end of which provided with a hook or lip Hitwhich engages over an in saluting; linger 81 secured on the free end ofthe armature iii. whereb the spring T9 acts as a retractile spring forthe armature. branch spring 82 is secured to the spring; T9 and carriesat its free end the second contact 8?) ol the circuit-breaker. One endof the magnet coils is connected to the hinding-post terminal 73: theopposite end is connected to the spring 79. which in turn is connectedto the opposite terminal plate 7-H and it is obvious that as thearmature is attracted by the magnet the circuit of the coils will bebroken between the contacts Ti and F3 to produce the usual vibratoevmovement of an electric bell.

The eoier plate 5-l ot' the casing carries the gong 84. and to this endis provided with a post ha ring a screw-receiving opening at its top toreceive the securing screw 86 for holding the gong in position. Thiscover has a notch 87 formed in its periphery, which notch is largeenough to accommodate the rock shaft 65 and its surrounding screw it).but the edge of the notch rests on the top face of the lug 57, so thatwhen the gasket 88 is placed in position and the cover plate (lumpedhome by means of the screws 56 the cover will make a sealed joint withthe us ing at all points, and, due to the tact that the only opening inthe casing, which is the opening accommodating the, rock sha ft 65, ispacked, the etlSiIlg' is sealed against mois ture and dust.

'hile l have illustrated and described in the accompanying drawings andspeeitirations certain embodiments of my invention. it Will heunderstood that the invention may take other embodiments or changes maybe made in those illustrated and described, without departing from thespirit of the invention as set forth in the appended claims.

Havin thus described my invention, what I eiaim as new and desire tosecure by Letters Patent. is:

1. An elect rie bell eompi'ising, a sealed casing. bell-wringingmechanism mounted wholly within said casing. a removable cover for saidcasing having a hollow. split. ex ternally threaded post formed on. theexterior thereof. a. stem mounted in said post, a gong eecentricallymounted on said stem. and a nut secured over said post for clamping saidstein in position.

2. An electric bell cmnprising a scaled casing, clectromagnetiehell-ringing mechanism including the hammer mounting an ranged withinand entirely mounted on said casing, a removable cover plate for theeasing removable without displacing any of the bell-ringing mechanism.said casing having a chamber formed on the exterior of the side wall adjlisting screws tor the bellriu;1' ing mechanism extending through theside wall of the easing into said chamber. and a eover for said chamberwhereby the bellringing mechanism may be adjusted from the exterior ofthe casing.

In witness whereof. I hare hereunto subscribed my name.

RE UBEN R. BENJ A MIN.

